# Find the mean: Class interval: (50 – 70,70 – 90,90 – 110,110 – 130,130 – 150,150 – 170) Frequency: (18,12,13,27,8,22)

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Find the mean:

 Class interval: 50-70 70-90 90-110 110-130 130-150 150-170 Frequency: 18 12 13 27 8 22

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Let’s consider the assumed mean (A) = 100

From the table it’s seen that,

A = 100 and h = 20

Mean = A + h x ($\frac{Σf_i u_i}{N}$)

= 100 + 20 x ($\frac{61}{100}$)

= 100 + 12.2

= 112.2